G643 (E) Service Manual Chapter 3. Engine Mechanical System 76
11. Apply clean engine oil to each bore to prevent
rusting.
NOTICE: Refer to “Notice” on page 1.
Install or Connect
1. Front oil gallery plugs. Coat plug outside
diameter with sealant (GM P/N 12346004) or
equivalent.
2. Rear oil gallery plugs.
Tighten
• Left rear plug to 20 Nm (15 lb. ft.).
• Right rear plug to 25 Nm (18 lb. ft.).
• Left side plug to 20 Nm (15 lb. ft.).
IMPORTANT: Do not have residue on camshaft
bearing or seizure may result.
3. Camshaft and balance shaft cup plugs to proper
depth. Coat plug outside diameter with sealant
(GM P/N 12346004) or equivalent.
4. Oil filter adapter, gasket, and bolts.
Tighten
• Bolts to 25 Nm (18 lb· ft.).
5. Coolant drain plugs.
Tighten
• Plugs to 20 Nm (15 lb· ft.)
6. Oil pressure fitting and sensor.
Tighten
• Fitting to 11 Nm (97 lb. in.) plus turn for
alignment if necessary.
Piston Disassembly
NOTICE: The connecting rod, bearing and cap need
to be stored together as mating parts, so they may
be reassembled in the same position from which
they were removed.
Figures 12-29 through 12-31
Tool Required:
• J 24086-B Piston Pin Remover and Installer
Set
Remove or Disconnect
1. Piston rings. In most cases, the rings should be
discarded and replaced with new ones at
assembly.
2. Connecting rod bearing inserts. If the inserts are
to be reused, place them in a rack so they may
be reinstalled in their original connecting rod and
cap.
3. Piston pin.
• Place the piston / connecting rod on support
fixture J 24086-20. Make sure the connecting
rod is fully supported.
• Press out the piston pin.
Clean
1. Piston.
• Remove all varnish and carbon deposits. DO
NOT USE A WIRE BRUSH.
• Remove the carbon from the ring grooves.
• Oil control ring groove holes.
Inspect
1. Piston pin bore in the piston and connecting rod.
Check for scuffing, burrs, etc.
2. Piston for scratches wear, etc.
3. Connecting rod for cracks, nicks, etc. If a
suitable jig is available, check the connecting rod
for a bent or twisted condition.
Figure 12-29 Piston Rings and Components
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